Schist

Also known as / varieties

Slate schist or phyllite / ottrélite

Extraction zone

Ardennes, province of Luxembourg

Mineralogical composition

Combination of dominant clayey minerals, siliceous, ferruginous and alumniferous minerals

Maximum dimensions of rough blocks

Length 3 m width 2 m thickness 1 m

Minimum thickness for application

1 cm - roofing slate 0,2 cm

Surface treatment

Untreated, split, sawn, honed, polished, even carved in the case of Ottré stone

Common applications

Outside : rubble stone, corner, voussoir, window and door sill, sill, step, wall coping, floor tile, furniture, roofing slate and wall covering

Inside : counter top, floor tile, interior decoration

Quarries :

Ardoisieres d’Herbeumont Ltd, Nelles Freres Ltd